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  1. using System;
  2.  
  3. public class Test
  4. {
  5.     static Func<int, int, bool> ConstructRelation(string s)
  6.     {
  7.         switch (s)
  8.         {
  9.             case ">":  return (Func<int, int, bool>)((a, b) => a > b);
  10.             case "<":  return (Func<int, int, bool>)((a, b) => a < b);
  11.             case "==": return (Func<int, int, bool>)((a, b) => a == b);
  12.             case ">=": return (Func<int, int, bool>)((a, b) => a >= b);
  13.             case "<=": return (Func<int, int, bool>)((a, b) => a <= b);
  14.             default: throw new ArgumentException("Unknown relation");
  15.         }
  16.     }
  17.  
  18. 	public static void Main()
  19. 	{
  20.         Func<int, int, bool> rel = ConstructRelation(">");
  21.         Console.WriteLine(rel(5, 4)); // выводит True
  22. 	}
  23. }
Success #stdin #stdout 0.01s 29664KB
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stdin
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Standard input is empty
stdout
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True
https://ideone.com/UWgKlU
language:
C# (gmcs 5.20.1)
created:
7 years ago
visibility:
public

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